public ResultSet executeQuery(String state){ ResultSet rs = executeQuery("select count(*) from Student where state='" + state + "'"); return rs }
谢谢各位,查询到相应记录后 rs = executeQuery(select count(*) from Student group by state order by state) 要怎么获得每个记录个数,这样吗? while(rs.next()) { rs.getInt(1); } 如果用rs.getInt(String) 这个String要怎么写? rs.getInt("count(*)");
ResultSet rs = executeQuery("select count(*) from Student where state='" + state + "'");
return rs
}
rs = executeQuery(select count(*) from Student group by state order by state)
要怎么获得每个记录个数,这样吗?
while(rs.next()) {
rs.getInt(1);
} 如果用rs.getInt(String) 这个String要怎么写? rs.getInt("count(*)");
rs.getInt(1);
}
这样就可以得到纪录的个数了
统计中我要求得各个段得百分比
flaot percent = 1.0/3
我想让这个percent只保留两个小数位,怎么保留??